#include <stdio.h>
int main() {
int lower, upper;
if (scanf("%d %d", &lower, &upper) != 2 || lower > upper || upper > 100) {
printf("Invalid.\n");
return 0;
}
printf("fahr celsius\n");
for (int fahr = lower; fahr <= upper; fahr += 2) {
double celsius = 5.0 * (fahr - 32.0) / 9.0;
//printf("%-4d %.1f\n", fahr, celsius);
printf("%d %5.1f\n", fahr, celsius);
}
return 0;
}